Explore the largest battery storage projects expected to come online in Washington and see all proposed battery storage projects on a map.
Last updated: September 2026
On this page, you can explore our database of planned battery storage projects in Washington. Each month, we track projects in development and update our list of the largest battery storage projects expected to come online in Washington.
As of September 2026, there are 7 battery storage projects in development in Washington, according to Cleanview's project tracker. Their total planned capacity is 1,655 MW. See also: operating battery storage projects in Washington→
Planned Projects
7
Planned Capacity
1,655 MW
Unique Developers
5
Map of planned battery storage projects in Washington. Marker size reflects planned capacity.
500 MW
Expected Online: September 2031
Location: Benton, Washington
Developer: BrightNight
300 MW
Expected Online: October 2029
Location: Garfield, Washington
Developer: Puget Sound Energy
260 MW
Expected Online: October 2027
Location: Grant, Washington
Developer: Clearway
200 MW
Expected Online: December 2028
Location: Thurston, Washington
Developer: TransAlta
200 MW
Expected Online: December 2026
Location: Pierce, Washington
Developer: BrightNight
170 MW
Expected Online: February 2029
Location: Kitsap, Washington
Developer: BrightNight
25 MW
Expected Online: September 2026
Location: Snohomish, Washington
Developer: Snohomish County PUD
Cleanview